Attribute: call_after_init

Important

VAR_INPUT declarations in functions or methods which use this attribute lead to compile errors. Reason: Input variables are unknown in this case at the time of the call, which occurs implicitly during the online change.

Note

This functionality is supported from compiler version 3.4.1.0.

The effect of this pragma is that a method is called implicitly after the initialization of a function block instance. For reasons of performance you have to add the attribute both to the function block and to the method in its own first line above the declaration part.

A method with this pragma is called after the FB_Init method and after the variable value of an initialization expression has been valid in the instance declaration.

Syntax:

{attribute 'call_after_init'}

Call: First line above the declaration part of the method and the function block

Example 257. example

Definition

{attribute 'call_after_init'}
FUNCTION_BLOCK FB_DoIt
... <functionblock definition>

{attribute 'call_after_init'}
METHOD FB_AfterInit
... <method definition>

The declaration implements the following declaration in the subsequent code processing:

fbDoIt : FB_DoIt := (in1 := 99);

Code processing

fbDoIt.FB_Init();
fbDoIt.in1 := 99;
fbDoIt.FB_AfterInit();

This allows a reaction to the user-defined initialization in FB_AfterInit.